On 3-receiver broadcast channels with 2-degraded message sets

  • Authors:

  • Chandra Nair;Zizhou Vincent Wang

  • Affiliations:

  • Department of Information Engineering, Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong;Department of Information Engineering, Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong

  • Venue:
  • ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 3
  • Year:
  • 2009

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Abstract

We consider a broadcast channel with 3 receivers and 2 messages (M0, M1) where two of the three receivers need to decode messages (M0, M1) while the remaining one just needs to decode the message M0. We study the best known inner and outer bounds under this setting, in an attempt to find the deficiencies with the current techniques of establishing the bounds. We produce a simple example where we are able to explicitly evaluate the inner bound and show that it differs from the general outer bound. For a class of channels where the general inner and outer bounds differ, we use a new argument to show that the inner bound is tight.